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Graphite powder is a chemical reaction is very sensitive material, in the different environment inside his resistivity will change, his resistance values will change, but is not the, graphite powder is one of non metal conductive material is very good. Because of its special structure, graphite has special properties: 1) high temperature resistant: Graphite melting point of 3850 + 50 DEG C, the boiling point of 42.5 DEG C, even the ultra high temperature arc ignition, weight loss is very small, coefficient of thermal expansion is also very small. Graphite strength increases with temperature, and the intensity of graphite is increased by one time at 2000. 2) the conductivity of graphite is one hundred times higher than that of general…
Graphene is currently known as the most hard, and has the highest conductivity and thermal conductivity of the material. Therefore, graphene and graphene sheets in the defense industry, aerospace industry, automotive industry, communications industry, energy industry and other fields, will have a wide range of applications. In recent years, many domestic and foreign organizations have focused on the application of the possibility of the role of graphene. Graphene has been in high performance composite materials, display and sensing materials, such as precision electronic functional materials, super capacitors, fuel cells, energy storage materials and other new energy materials application development aspects, have very outstanding performance. Especially in the high performance composite materials, the performance is excellent. It should be emphasized that…
In EDM process, due to EDM parameter selection of inappropriate, or processing chip discharge is not so good reasons to produce concentrated discharge arcing, such as electric sparks are scarce and red sparks, the electric discharge sound has become irregular, then produce the so-called unstable discharge. Processing is not stable, the processing current is not in accordance with the set of the current work, the working current is small, and in the process of processing will appear a variety of processing defects, resulting in waste. Often the following abnormal discharge phenomenon. (1) the discharge is not stable at the start of the process At the beginning of the processing of graphite electrode, due to the workpiece being chip cutting, burr,…
